Fix for shorter if let lifetime

[est31]

Context: Rust compiler PR rust-lang/rust#107251 wants to change the lifetime of things inside the if let matcher. The PR would break the build of this project (out of only a handful of breakages):

error[E0716]: temporary value dropped while borrowed
   --> src/main.rs:343:31
    |
343 |         if let Ok(ref home) = env::var("HOME") { home } else { "$HOME" } );
    |         ----------------------^^^^^^^^^^^^^^^^--------------------------
    |         |                     |                       |
    |         |                     |                       temporary value is freed at the end of this statement
    |         |                     creates a temporary value which is freed while still in use
    |         borrow later used here
    |
    = note: consider using a `let` binding to create a longer lived value

The new version compiles both before and after the PR.

[kumavale]

I understand the change in lifetime.
Thank you for the PR!